WO2007065570A1 - Procede et dispositif d'etalonnage d'un capteur d'humidite - Google Patents

Procede et dispositif d'etalonnage d'un capteur d'humidite Download PDF

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Publication number
WO2007065570A1
WO2007065570A1 PCT/EP2006/011317 EP2006011317W WO2007065570A1 WO 2007065570 A1 WO2007065570 A1 WO 2007065570A1 EP 2006011317 W EP2006011317 W EP 2006011317W WO 2007065570 A1 WO2007065570 A1 WO 2007065570A1
Authority
WO
WIPO (PCT)
Prior art keywords
water vapor
mixing chamber
carrier gas
temperature
sensor
Prior art date
Application number
PCT/EP2006/011317
Other languages
German (de)
English (en)
Inventor
Walter Knoblach
Jan Zach
Haris Cadordzic
Original Assignee
Areva Np Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Areva Np Gmbh filed Critical Areva Np Gmbh
Publication of WO2007065570A1 publication Critical patent/WO2007065570A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0006—Calibrating gas analysers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity

Definitions

  • the invention relates to a method and a device for calibrating a moisture sensor.
  • a system part containing water or water vapor for example the primary circuit line of a
  • pressure water core reactor on the occurrence of a leak, it is known from EP 0 175 219 to arrange a manifold on the system part, into which the water emerging from the system part in the event of a leak or the water vapor emerging from the system part can penetrate.
  • the known manifold consists of a tube which is impermeable to water or water vapor and which is provided in its longitudinal direction with a plurality of openings closed with a microporous sintered metal material through which water or water vapor can diffuse into the interior of the tube.
  • DE 24 31 907 C3 the location at which the water or water vapor has penetrated into the collecting line is then determined.
  • This location corresponds to the point at which water or water vapor has escaped from the monitored part of the system.
  • a pump connected to the collecting line, for example in pressure operation, a compressor at the entrance of the line, the water vapor which has entered the collecting line, together with a carrier gas located in the collecting line, is fed to a moisture sensor which is also connected to the collecting line.
  • the moisture sensor With this moisture sensor, the water vapor output concentration is measured as a function of time and monitored for exceeding a threshold value.
  • Flow velocity can be determined from the time span between the switching on of the pump and the arrival of the water vapor at the moisture sensor, i.e. the point in time at which the threshold value is exceeded, the place at which water or water vapor enters the collecting line and thus the location of the leak at the system part can be determined.
  • Such a calibration involves considerable effort for the operator of the system.
  • expensive devices such as a regulated moisture generator and a calibrated moisture sensor are required for calibration.
  • the calibration of a moisture sensor is time-consuming, since the entire measuring range of interest has to be covered with a sufficient number of measuring points, which cannot be approached immediately one after the other due to the inevitable hysteresis effects.
  • a method for calibrating a moisture sensor is known from WO 94/28410, in which the moisture sensor is introduced into the gas circuit of a calibration device in which a gas circulates, which is saturated with water vapor and whose temperature is known. This temperature corresponds to the dew point, from which the water vapor concentration can be deduced directly.
  • the known calibration device it is also possible to calibrate a moisture sensor in situ, ie at the location where it is attached for monitoring the water vapor content of a process gas.
  • the invention is based on the object of specifying a method and a device for calibrating a moisture sensor which, with high measuring accuracy, is low
  • Effort can also be carried out in short intervals.
  • a moisture sensor Calibrating a moisture sensor a carrier gas with a known water vapor inlet concentration and a known volume flow into a mixing chamber which communicates via a water vapor permeable partition with a water reservoir, the temperature of which is set to a constant value, and in which water vapor is added to the carrier gas.
  • the moisture sensor is used to determine a measured value for the initial water vapor concentration in the mixture of water vapor and carrier gas flowing out of the mixing chamber. This measured value is compared with an actual value of the water vapor
  • the invention is based on the consideration that the water vapor absorption of the carrier gas flowing through the mixing chamber, for example air, with constant structural conditions of the mixing chamber and the dividing wall is determined exclusively by and through the water vapor inlet concentration, the temperature of the water reservoir and the volume flow the relationship given is.
  • c Out [-] mean the water vapor outlet concentration at the outlet of the mixing chamber (actual value)
  • Partition wall which the permeability and dimension solutions (will be determined once during commissioning)
  • the then resulting actual value of the water vapor output concentration C out at the output can either be determined by interpolation from a look-up table (characteristic curve field) that was created and stored during a calibration when the device was commissioned, or using the above relationship are calculated if, during the calibration of the device, the parameters describing the properties of the mixing chamber (geometry and vapor permeability of the partition) have been determined experimentally for different temperatures T w .
  • a look-up table characteristic curve field
  • the volume flow of the carrier gas and the temperature of the water reservoir are measured and regulated, the measurement accuracy during calibration is increased.
  • a device according to the invention is integrated in a so-called leakage monitoring system (moisture leakage monitoring system, FLÜS), which contains a sensor line connected to a pump, into which water vapor can penetrate and which comprises a moisture sensor connected to the sensor line to detect the penetrated water vapor, it is possible to remotely calibrate the humidity sensor remotely from a control room at regular intervals and the operational safety of the leakage monitoring system is significantly improved.
  • a leakage monitoring system moisture leakage monitoring system
  • FIG. 1 shows a device according to the invention in a schematic basic illustration
  • a device comprises a mixing chamber 2, which communicates with a water reservoir 6 via a partially permeable partition 4.
  • the partially permeable partition for example made of a sintered metal material, is permeable to water vapor, but impermeable to water.
  • the partition 4 can directly adjoin the water in the water reservoir 6 on its flat side facing the water reservoir 6. In principle, however, there can also be a gas cushion saturated with water vapor, usually air saturated with water vapor, between the water in the water reservoir 6 and the membrane, since the diffusion speed of the water vapor through the partition 4 is essentially determined only by the difference in the partial pressures of water vapor in the mixing chamber 2 and in the water reservoir 6.
  • the water reservoir 6 is connected to the ambient atmosphere via a pressure compensation line 7 in order to avoid excess pressure when the water reservoir 6 is being heated.
  • the mixing chamber 2 has an inlet 8 and an outlet 10 for a carrier gas, usually air, flowing through it.
  • the input 8 is connected via an input line 12 to a compressor 14 which, as carrier gas, sucks in air from the environment and conveys it to the mixing chamber 2, through which it flows and in which it absorbs water vapor, so that at the outlet 10 a mixture of water vapor and carrier gas (Air) is present, its water vapor output concentration by the volume flow Q v , the water vapor input concentration C 0 in the carrier gas at the inlet 8, the geometric conditions of the mixing chamber 3 and the physical properties of the partition 4 and the temperature T w of the water reservoir 6 according to given above relationship.
  • Air water vapor output concentration
  • An output line 16 is connected to the output 10, to which a moisture sensor 18 to be calibrated is connected, with which a measured value of the water vapor
  • the water reservoir 6 is heated with a heating device 20 so that its temperature T w can be set to predeterminable values.
  • the heating device 20 is connected to a control device 22, which uses control signals S1 to either adjust the heating power to a predeterminable value and thus controls the temperature T w of the water reservoir 6 or regulates the temperature T w of the water reservoir 6.
  • a temperature sensor 23 is arranged in the water reservoir 6, the measured values of which are fed to the control device 22, so that the temperature T w of the water reservoir can be regulated to a predetermined value.
  • the control device 22 also controls or regulates the compressor.
  • a flow sensor 24 is arranged in the input line 12, with which the mass flow Qv, for example the volume flow, is measured through the input line 12. The corresponding measured values are then also processed in the control device 22 for generating control signals S2 for regulating the compressor 14.
  • the zero point of the moisture sensor 18 can be calibrated in this operating mode of the device.
  • the ones from Humidity sensor 18 for various known actual values of C d out he steam outlet concentration measured measurement values c M can then be used to calibrate the moisture sensor 18th
  • the bypass line 30 is also connected via a three-way valve 32 to a sensor line 34 of a moisture leakage monitoring system, through which carrier gas, generally air, is conveyed to the moisture sensor 18 at constant time intervals by a compressor 36.
  • carrier gas generally air
  • Water vapor can penetrate into the sensor line 34 either along the entire line or at predetermined line positions.
  • the sensor line 34 is arranged on a system part carrying water or water vapor. In the event of a leak in the system part, a measurement value c M for the water vapor concentration is then measured with the moisture sensor 18, to which an actual value c ⁇ is assigned on the basis of the previous calibration and which can be compared in the control device with a predetermined threshold value c s .
  • the occurrence of a leak is indicated when the actual value c ⁇ exceeds the threshold value c s .
  • the three-way valve 32 is also controlled by the control device 22 via control signals S5, so that an automatic switchover from the monitoring mode to the calibration mode is possible.
  • the actual value c ⁇ of the initial water vapor concentration in air is plotted for a device explained with reference to FIG. 1 against the speed of air in the mixing chamber, which in the exemplary embodiment has an inner diameter of 6 mm.
  • the diamonds represent measurement points that were obtained at a temperature T w of the water reservoir of 25 °.
  • the solid lines are calculated values which have been obtained using the above-mentioned model. It can be seen from the measurement points and the curves shown in the diagram that the model describes the water vapor output concentration generated at the outlet of the mixing chamber with high accuracy.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'étalonnage d'un capteur d'humidité (18), procédé selon lequel un gaz vecteur, présentant une concentration d'entrée en vapeur d'eau déjà connue et un débit massique déjà connu (Qv), circule dans une chambre de mélange (2) qui communique, par l'intermédiaire d'une paroi de séparation perméable à la vapeur d'eau (4), avec un réservoir d'eau (6) dont la température (Tw) est réglée sur une valeur constante, et dans laquelle la vapeur d'eau est mélangée au gaz vecteur. Une valeur de mesure (CM) pour la concentration de sortie en vapeur d'eau dans le mélange sortant de la chambre de mélange, constitué de vapeur d'eau et de gaz vecteur, est déterminée à l'aide du capteur d'humidité (18) et comparée à une valeur réelle (Cout) de la concentration de sortie en vapeur d'eau dans le mélange sortant de la chambre de mélange (2), fournie par une relation qui dépend de la température (Tw) du réservoir d'eau (6), du débit massique (Qv) et de la concentration d'entrée en vapeur d'eau dans la chambre de mélange (2).
PCT/EP2006/011317 2005-12-09 2006-11-25 Procede et dispositif d'etalonnage d'un capteur d'humidite WO2007065570A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510059304 DE102005059304B3 (de) 2005-12-09 2005-12-09 Verfahren und Einrichtung zum Kalibrieren eines Feuchtigkeitssensors
DE102005059304.6 2005-12-09

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Publication Number Publication Date
WO2007065570A1 true WO2007065570A1 (fr) 2007-06-14

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DE (1) DE102005059304B3 (fr)
TW (1) TW200730818A (fr)
WO (1) WO2007065570A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021164363A1 (fr) * 2020-02-17 2021-08-26 青岛理工大学 Procédé d'étalonnage de capteur ect
CN113574375A (zh) * 2019-03-08 2021-10-29 球波株式会社 用于校准水分传感器的系统、方法和程序
US12013312B2 (en) 2018-11-27 2024-06-18 Korea Atomic Energy Research Institute Sensor tube for humidity sensor and humidity sensor assembly using same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008005486B9 (de) * 2008-01-22 2019-01-10 Jürgen Dillenz Vorrichtung zur kontrollierten Verdunstung von Flüssigkeiten in Gasen
WO2016008273A1 (fr) * 2014-07-15 2016-01-21 国家电网公司 Plate-forme de verification pour capteur d'humidite d'hexafluorure de soufre gazeux sous pression
BE1026032B1 (nl) * 2018-02-20 2019-09-20 Atlas Copco Airpower Nv Inrichting voor het bewaken van de kwaliteit van de perslucht van een persluchtnetwerk en het kalibreren van een meettoestel daarin gebruikt en werkwijze daarbij toegepast

Citations (6)

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Publication number Priority date Publication date Assignee Title
US3521865A (en) * 1968-05-20 1970-07-28 Du Pont Generation of accurately known vapor concentrations by permeation
US3856204A (en) * 1973-03-12 1974-12-24 Ecology Board Inc Gas emitting device
US4399942A (en) * 1981-11-09 1983-08-23 Gc Industries Gas emitting device
EP0307265A2 (fr) * 1987-08-14 1989-03-15 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Dispositif de production de gaz
EP0572363A2 (fr) * 1992-05-26 1993-12-01 Saes Getters S.P.A. Dispositif d'étalonnage par l'introduction isothermique à débit faible de l'humidité dans un courant de gaz sec
GB2278203A (en) * 1993-05-20 1994-11-23 Euratom Device and method for calibration of sensors

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DE2431907C3 (de) * 1974-07-03 1978-03-09 Wolfgang Dipl.-Phys. Dr.- Ing. 7500 Karlsruhe Issel Verfahren und Vorrichtung zur Bestimmung von Konzentrationsprofilen flüssiger oder gasförmiger Stoffe längs einer Strecke
EP0175219B1 (fr) * 1984-09-19 1988-05-11 Wolfgang Dr.-Ing. Issel Conduit tubulaire pour la détermination de profils de concentration de substances liquides ou gazeuses

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521865A (en) * 1968-05-20 1970-07-28 Du Pont Generation of accurately known vapor concentrations by permeation
US3856204A (en) * 1973-03-12 1974-12-24 Ecology Board Inc Gas emitting device
US4399942A (en) * 1981-11-09 1983-08-23 Gc Industries Gas emitting device
EP0307265A2 (fr) * 1987-08-14 1989-03-15 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Dispositif de production de gaz
EP0572363A2 (fr) * 1992-05-26 1993-12-01 Saes Getters S.P.A. Dispositif d'étalonnage par l'introduction isothermique à débit faible de l'humidité dans un courant de gaz sec
GB2278203A (en) * 1993-05-20 1994-11-23 Euratom Device and method for calibration of sensors

Non-Patent Citations (1)

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Title
PICHLMAIER J: "BEFEUCHTUNG VON PRUEFGAS FUER DIE KALIBRIERUNG VON GAS- UND FEUCHTESENSOREN", TECHNISCHES MESSEN TM, R.OLDENBOURG VERLAG. MUNCHEN, DE, vol. 58, no. 12, 1 December 1991 (1991-12-01), pages 471 - 477, XP000275370, ISSN: 0171-8096 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12013312B2 (en) 2018-11-27 2024-06-18 Korea Atomic Energy Research Institute Sensor tube for humidity sensor and humidity sensor assembly using same
CN113574375A (zh) * 2019-03-08 2021-10-29 球波株式会社 用于校准水分传感器的系统、方法和程序
WO2021164363A1 (fr) * 2020-02-17 2021-08-26 青岛理工大学 Procédé d'étalonnage de capteur ect

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DE102005059304B3 (de) 2007-05-31
TW200730818A (en) 2007-08-16

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